US tightens rules for visa-free visits

After extremist attacks in Europe, the United States will tighten security procedures for its visa waiver program for visitors from friendly countries, officials said Monday. Travelers will now be required to declare previous visits to any country the US Department of Homeland Security has deemed a "terrorist safe haven." Their registrations will also come under greater scrutiny from US agencies, which in turn will work in closer cooperation with allied police and intelligence outfits.